Stay-bolt.



J. R. FLANNERY, B. E. D. STAFFOR D & E. I. DODDS.

STAY BOLT.

APPUCATION FILED EB. 21. l9|7.

Patented Oct. 15, 1918.

INVENTORS UNITED STATES PATENT OFFICE.

JOHN ROGERS FLANNERY, BENJAMIN E. D. STAFFORD, AND ETHAN I. DODDS, OF PITTS- BURGH, IPENNSYLVANIA, ASSIGNORS TO FLANNERY BOLT COMPANY, OF PITTS- BURGH, PENNSYLVANIA. I

STAY-BOLT.

Patented Oct. 15, 1918-.

Application filed February 21, 1917. Serial No. 150,198.

To all whom it may concern:

Be it known that we, J OHN R. FLANNERY, BENJAMIN E. D. STAFFORD, and ETHAN 1. Doom, citizens of the United States, and residents of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Stay-Bolts; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in staybolts for boilers,the object of our present invention being to produce a staybolt for use in what is known in the art as a flexible staybolt structure, in which the head of the bolt is made separate from the body and firmly secured thereto in a manner to eflectually close that end of a continuous tell-tale hole which terminates within the headed end of the bolt.

With this and other obj ectsin view, the invention consists in certain novel features as hereinafter set forth and pointed out in the claims.

The accompanying drawing is a longitudinal sectional view of a staybolt illustrating an embodiment of our invention.

1 represents the body of a staybolt having a longitudinal bore 2 extending through the same, and 3 indicates the head of the bolt and in the drawing is shown as being spherical in form.

The body portion 1 of the bolt is preferably made of iron, while the head 3 may be made of steel.

In constructing the bolt, a recess 4 is made in the end thereof which receives the head 3. The steel head 3 is formed with a socket 5, the annular wall of which tapers'somewhat toward the open end of said recess.

The recessed end of the body of the boltwill be heated to a suitable temperature and the head 3 applied thereto so that the recessed end of the bolt will enter the tapering socket in the head. When the body and head are being thus assembled, a ball 6 will be disposed within the socket 5 in position to enter the recess 4 in the bolt body. Now as the head is forced onto the bolt body or the latter forced into the socket in the head,

it also serves to tightly close the end of the tell-tale hole 2 within the headed end of the bolt,said tell-tale hole extending from this point continuously to the inner end of the bolt where any steam or water entering said bore in case of rupture of the bolt anywhere between the boiler sheets may be discharged.

Having fully described our invention what We claim as new and desire to secure by Letters-Patent, is:

l. A staybolt comprising a body portion,-

a separate head having a socket therein reeeiving one end of said body portion, and means expanding the metal of the body within the socket of the head and rigidly securing said head on the end of said body portion.

2. A staybolt comprising an iron body and a separate steel head having a socket to receive one end of said iron body, and means in the head expanding the iron of the body within the socket of the steel head and rigidly securing the latter to the end of the body.

3. A stay bolt comprising a tubular body portion, a separate head and means permanently securing the head to the body and closing one end of the bore of said tubular body, said head constituting a rigid member of the bolt and affording means whereby the end of the bolt may be mounted at a boiler sheet.

4:. A stay bolt comprising a tubular body having a recess in onev end, a separate head having a tapering socket to receive the re cessed end of the tubular body, and an expanding member disposed within the recess in the bolt body and engaged by said head, said expanding member closing one end of the bore of said tubular bolt body.

5. A stay bolt comprising a tubular body having a recess in one end, a separate head specification in the presence of tWo subscrib- 1 havingv a taperlng socket to receive the relng Witnesses.

cessedq'end of the tubular body, and. anexr JOHNMROGERS FLANNERY pending body disposed in said recess and engaged by the head, said expanding body se- K D% F curing the head rigidly to the body and constituting a closure for the end of the Witnesses:

' bore, within the head. 7 r F. H. ALLISON,

In testimony whereof, We have signed this EDWIN S. RYOE.

Copies 61 this patent may be obtained for five cents each, by 'eddressing the Commissioner of Patents,

7 Washington, 11.0.." 

